docs: banner kit — visual identity ("Diagrammatic Hush")

[hyperpolymath]

Summary

Adds a 1920×480 dark theorem-proof banner at the top of both READMEs. The procession of 4-node constellations diminishes from left to right as edges drop into fibers below the base axis — a direct visual of "loss that is not total erasure": identity (nodes) preserved, residues (amber marks) accumulate.

The design philosophy ("Diagrammatic Hush" — Bourbaki / TikZ-cd / Felice Frankel lineage, not stock vector illustration) is documented alongside the asset.

What's added

• docs/assets/banner.svg + docs/assets/banner.png — the banner asset (1920×480).
• docs/assets/banner-philosophy.md — design rationale.
• tools/banner/build-banner.mjs — regenerator (zero deps; node tools/banner/build-banner.mjs emits docs/assets/banner.svg; PNG must be re-rasterised separately).
• README.md + readme.adoc — banner reference inserted at top, before H1.

Verification

• node tools/banner/build-banner.mjs regenerates byte-identical banner.svg.

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 72 issues detected

Severity	Count
🔴 Critical	17
🟠 High	35
🟡 Medium	20

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "No test directory or test files found",
    "type": "no_tests",
    "file": "/home/runner/work/echo-types/echo-types",
    "action": "flag",
    "rule_module": "honest_completion",
    "severity": "high",
    "deduction": 20
  },
  {
    "reason": "Issue in codeql.yml",
    "type": "missing_workflow",
    "file": "codeql.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in secret-scanner.yml",
    "type": "missing_workflow",
    "file": "secret-scanner.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in agda.yml",
    "type": "unknown",
    "file": "agda.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in agda.yml",
    "type": "unknown",
    "file": "agda.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in governance.yml",
    "type": "unknown",
    "file": "governance.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in hypatia-scan.yml",
    "type": "unknown",
    "file": "hypatia-scan.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "unknown",
    "file": "mirror.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in scorecard.yml",
    "type": "unknown",
    "file": "scorecard.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Agda postulate assumes without proof -- potential soundness hole (1 occurrences, CWE-704)",
    "type": "agda_postulate",
    "file": "/home/runner/work/echo-types/echo-types/tutorial/provenance_debugging/ProvenanceDebugging.agda",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  }
]

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